Speed-regulating means



.T. A. BRAGG.

SPEED REGULATING MEANS. APPLICATION FILED JUNE H, 1919.

1,358,929. Patented Nov. 16, 1920 4 SHEETS-SHEET l- T. A. BRAGG. SPEED BEGULATING MEANS.

APPLICATION FILED JUNE H, 1919.

0 J m a 9 a l l 1H Z 1 In H 6 5 H M 4 3 ii: Wu 4 4 4 w fl M M m 0w P w w INVENTOR I T. A. BRAGG.

SPEED REGULATING MEANS. APPLICATION FILED JUNE H, I919.

1,358,929. I Patented NOV. 16, 1920.

4 SHEETS-SHEET 3.

I I I I I I I I I l I INVENTOR 13% 144 UNITED STATES PATENT OFFICE.

THOMAS A. BRAGG, OF TOLEDO, OHIO, ASSIQNOR TO THE OWENS BOTTLE COMPANY, OF

TOLEDO, OHIO, A CORPORATION OF OHIO. I

. SPEED-REGULATING MEANS.

Specificationof Letters Patent Patented N V. 16, 1920.

Application filed June 11, 1919. Serial No. 303,395.

To all whom it may concern:

Be it known that I, THOMAS A. BRAec, a

citizen of the United States, residing at T0- 'particularly to the ty%e ledo, in the county of Lucas and State of Ohio, have invented new and useful Improvements in Speed-Regulating Means, of which the following is a specification.

My invention relates to an improvement in machines for engraving or sinking dies, or reproducing in cameo or intaglio, and

of machine disclosed in the patent to eller and Warman, No. 956,769, May 3,1910.

In said patent there is described a machine especially adapted to reproduce dies of the same size and contour as the templet or model. An object of the present invention is to provide means to materially increase the output of a machine of this character.

In the accompanying drawings:

Figure l is a front elevation of a machine embodying the principles of'my invention.

Fig. 2 is a sectional view at the line 2-2,

Figi-"8 is a sectional view of the multiple speed reversingclutch; I

Fig. 9 shows a hand lever forv shifting speeds.

Fig. 10 is a diagram showing a modification of the electrical speed controlling apr paratus' I r Referring to the drawings, the machine is mounted on 'a base 8 from which rises a standard 9, on the upper end of which is supported a horizontally di o-sed frame 10. Mounted to travel horizontal y onthe'frame 10 is a plate 11 having vertical" arms '12, 13 projecting therefrom, which through pivotal connections 14, 15 carry a frame 16.

Through the above construction the frame 16 is caused to travel horizontally with the plate 11 and at the same time is perm tted to swing about its pivot connections.

. motor.

Mounted on this swinging frame and central to its axis of oscillation is a motor 17 provided with a pulley .18, around which passes a belt or rope 19 to pulleys 20, for driving thecutters. Mounted on the forward end of the frame 16 are cutters 21 and a tracing tool 22, the latter located in a vertical line with the cutters and equidistant from the line of the pivots 14, 15. The cutters and tracing tool are movable horizontally with the swinging frame toward and from the work 23 and templet 24.

Attached to the plate 11 is a bar 25 (Fig. 3) which carries a roller 26 supporting a cable 27 attached at one end to the frame 16 at a point 28, and having a weight 31 attached to its other end, for holding the cutters in contact with the work. For reciprocating the slide 11 carrying the frame 16 and the cutters, any approved mechanism may be used, as for example, that disclosed in the patent to Keller and Warman heretofore mentioned.

A vertically disposed face plate 32 carrya a shaft 41, said shaft connected to the screw 35 by the coupling 30. rom this construction it will be seen that'when the screw 1s rotated, the faceplate will be moved vertically either upwardly or downwardly, according to the direction of rotation of the Attached to the face plate 32 is an extension 42 through an opening-in which passes a rod 43, connected at its lower end to a reversing switch 46- controlling the motor 36. When the screw 35 is rotated in a direction to move the plate 32upwardly, the extension 42 engages a stop 44 on the rod 43 and lifts the rod from the Fig. 1 position, thereby throwing the switch 46 and reversing the direction of the motor 36. --The face plate then moves downwardly until the stop 42 engages a stop 45 on the rod 43 and throws the switch to the Fig. 1 position, again reversing the direction of the motor. 'Thus a continuous reciprocating of the plate 32 is obtained. The reversing switch 46 is held in its respective positions by a spring actuated stop 47. I

Mounted in an extension of the main standard 9 is a column 51 having one end formed in a yoke 52, pivotally su porting a cross arm 53 at a fulcrum 54. ttached to the cross arm at a point 55 is a chain 56 carrying a counter-weight 57, which acts to counter balance the face plate 32. On the opposite end of the cross arm is a segment 60 to which a chain 61 is attached at 62, whereby the pull of the chain is always vertical or in the direction of theaxis of With the above described the screw 35. construction it will be seen that any unnecessary strain on the motor will be eliminated. I 7

Referring to Fig. 5', in which is shown a sectional view of the work 23, it will be noted that between the points 63, 64 there is a surface 65 which is substantially straight or free fromany sharp curves or abrupt changes in direction and thereby permits the cutting tool to make a substantially straight out of considerable length. In making this straight out a comparatively high speed is permissible, whereas, in cutting along the surfaces 66 and 67 where the direction of movement changes abruptly or is irregular, the movement must be comparatively slow to permit the tracin tool accurately to follow the pattern. H eretofore' it has been customary to maintain throughout the cutting a uniform speed, slow enough to permit accurate cutting where the pattern is irregular in outline.

The present invention provides means to along the surface 65, while the rheostat alspeed up the work while the cut is being made along a straight surface or a portion devoid of any abrupt changes in direction; and thereby greatly increase the output of the machine. For this purpose, the speed of the motor 36 is automatically varied and controlled, as will presently appear.

Referring to Fig. 4, a circuit for the field winding of the motor 36 may be traced from the positive main A, through conductor A, resistance coil 68, rheostat 69, field coils of motor 36 and a return conductor B to the negative main B. The resistance 68 permits-the motor to run at a comparatively high speed adapted for the straight cut lows for manual regulation of the speed. For cutting out the resistance68 and re 'ducing the speed of the motor, a shunt circuit is provided around the resistance, comprising a conductor A and switch 70.

Attached to the face plate 32 (Fig. 4) is a rod 71 on which are mounted cams 81 and 82 individually adjustable up and down on the rod. Mounted on the frame 33 is a switch box carrying a switch controlled by'the cam. The switch comprises a switch lever 72 pivoted at 73 and carries a roller- 74 at one end and a contact 75 at the other end. Also mounted in the switch box is a stationary contact 76 connected to the rheostat through line A Assuming that the face plate 32, which has a vertical reciprocating movement, is on its downward stroke and the cutter making its straight out, the contacts 75, 76 are held apart by a spring 84 so that the resistance 68 is in the motor field circuit. The motor 36, therefore, runs at a high speed while the cutter is on the straight surface 65. As the switch roller engages the cam 81, the switch is closed, thereby short circuiting the resistance 68, so that the motor is slowed down to a speed suitable for cutting along the irregular surface 67. This reduced speed is maintained until the face plate has completed its down stroke. The motor is then reversed and runs at reduced speed until the face plate has traveled upward far enough-to release the roller 74 from theram 81 and permits the switch to open, thereby speeding up the motor. The motor maintainsv its increased speed until the roller engages the cam 82, again closing the switch and slowing down the motor for the out along the surface 66.

From the above description it will be seen that the speed of the face plate 32 is greater in the middle of its stroke than it is on the ends of its stroke, thereby allowing for a slow cut on the sharply curved or irregular surfaces and a fast cut on the straighter surface, thus materially increasing the speed of production. By adjusting the cams 81 and 82 up or down, the points at which the speed changes can be adjusted to suit the work. The rheostat 69 serves in the. usual manner as a means to manuall regulate the speed of the motor.

Fig. 6 shows an arrangement in which a combined reversing clutch and speed changing gear device 90 is interposed between the motor 36 and the screw shaft 35. The motor is thus permitted to run continuously in one direction, the reversalof the screw shaft 35 being effected by operating the clutch lever 91 connected to a rod 431 which corresponds in function and operation to the rod 43 (Fig. l).

The combined reversing clutch and speed changing device, as shown in detail in Figs."

palslition so that the shaft 94 runs =idly.

en s ifted downward by lowering the lever 91 the clutch sleeve engages a c utch The dog 200 is shiftable verticall obtain the lowest spee plate on a bevel gear 99 loose on the shaft 94 and connected through an idler gear 100 to drive a gear 101. The gear 99 being thus connected through the clutch sleeve to the shaft 94, is driven by the latter in the same direction in which the shaft rotates and through the gear 100 rotates the gear 101. in the reverse direction. The gear 101 has a driving connection with the shaft 35. By shifting the clutch lever up the clutch sleeve is disconnected from the gear 99 and connected directly with the gear 101, thereby driving the shaft 35 in the same directionas the shaft 94.

and pinions 106, 107, 108 and 10.9 meshing respectively with the gears 105, 104, 103 and 102, said pinions bein keyed to rotate with a sleeve 110 on whic they are mounted.

downward to connect with any one of t e gears 103, 104 and 105. For this purpose said dog is mounted on a rod 111 slidable in the hollow shaft 94, said rod having rack teeth to engage a pinion 112 on a horizontal shaft 113 provided at its outer end with a pinion 114 to mesh with a gear segment 115 on a stud shaft 116 to which is attached a hand lever 117'. The latter is provided with a latch "118 to hold it at any one of the four positions in which the dog 200 connects with the respective gears. By shifting the dog 200 downward intoengagement with the gear 103 the motion is transmitted from the worm wheel95 through gears-102, 109, 108 and 103, thereby decreasmg the speed. In

like manner power may be transmitted through gears 107 and 104 to further decrease the speed, also (gears 1'06 and 105 to Fig. 10 shows diagrammatically an arrangement in which the resistance 68 of Fig. 4 is omitted, the automatic switch being arranged in a shunt circuit around the rheostat 69. With. this arrangement the closing of the switch short circuits the v rheostat 69, thereby strengthening the motor field and causing a reduction of speed. This arrangement permits the relative speed of the work duringthe slow and fast cuts to be adjusted through a wide range by adjusting the rheostat. At the same time the speed ofthe work relative to that of the motor may be regulated and adjusted by the speed changing gearing controlled by the lever a What I claim is:

1. In a machine. of the character described, the combination with a horizontal reciprocable plate, a horizontal swinging frame thereon, a vertically reciprocating face plate, a pattern and tracer carried by the said frame and face plate, and means to operate said vertically reciprocating plate at an automaticall variable speed.

2. The combinatlon of a tracer,a'pattern in contact therewith, means for causing the tracer to repeatedly traverse the pattern, and automatic means to cause a comparatively slow relative movement of the tracer and pattern during predetermined portions of each said traverse and a more rapid movement during other portions of the traverse.

3. The combination of a tracer, a pattern, a motor for reciprocating one of said parts and thereby cause the tracer to repeatedly traverse the pattern, and automatic means to reduce the speed of the motor and cause a relatively slow movement of the tracer and pattern during a predetermined portion of each traverse and to increase the speed of the motor and thereby increase the speed of said relative movement during another portion of the traverse.

4; The combination of a work carrying plate, a templet on said plate, a tracer, a cutter, means to hold thetracer and cutter to the templet and work piece respectively,

an electric motor, driving connections berepeatedly traverse the templet and the cutter to traverse the work piece, said templet presenting a comparatively straight path for the tracer during a portion of each reciprocation, and an irregular or direction changing path during another portion of the. traverse, and automatic means for causing the motor to run at a comparatively high speed while the tracer moves along said straight path.

5. The combination of a work carrying plate, a templet on said plate, a tracer, a cutter, means to hold the tracer and cutter to the templet and work piece respectively, an electric motor, driving connections between the motor and said plate for reciprocating the latter and causing the tracer to repeatedly traverse the templet and the cutter totraverse the work piece, said templet presenting to the tracer a surface substantially parallel to the direction of movement of said plate during a portion of' its movement, and an irregular surface during another portion of its movement, and automatic means for accelerating the speed of the motor while the tracer traverses said parallel surface.

6. The combination of a work carrying .plate, a templet on said plate, a tracer, a

an electric motor, driving connections between the motor and said plate for reciprocating the latter and causing the tracer to repeatedly traverse the templet and the cutter totraverse the Work piece, said templet presenting a comparatively straight path for the tracer during a portion of each re-,

ciprocation, and an irregular or direction changing path during another portion of the traverse, automatic means for causing the motor to run at a comparatively high speed While the tracer moves along said straight path, and means to adjust the relative speed of the motor for said straight and irregular portions of the work.

7. The combination of a work carrying plate, a templet on said plate, a tracer, a cutter, means to hold the tracer and cutter to the templet and Work piece respectively, an electric motor, driving connections between the motor and said plate for reciprocating the latter and causing the tracer to means for accelerating the speed of the motor While the tracer traverses said parallel surface, manual means to regulate the amount of said acceleration, means to regulate the speed of the work carrying plate relative to that of the motor, and means to adjust the point at which the speed is changed.

Signed at Toledo, in the county of Lucas and State of ()hio, this 9th day of June,

THOMAS A. "BRAGG. 

